I need to exchange British pounds to US dollars before my 5.50 am train to Cambodia. I'm already in the city and made a silly mistake of not exchanging during the day. My hotel does not do currency conversions.

It is possible to withdraw US$ in - at least from what I know - Siem Reap with you credit card. So don't exchange to much of you Pound, since they change from Pound to Baht to Dollar which is not so good.
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greg121Nov 26 '12 at 9:57

2 Answers
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Having now been and done this, I can say I didn't find any pure banks/exchanges open at 5am. However there was an exchange that did the same as my hotel doing a pound to bhat then to dollar conversion.

If you are departing from Hua Lamphong Train Station then you can exchange money there according to IHateTaxis.com. I guess they will be open 24 hours, the ones at the airport are open 24 hours and I think they are open 24 hours in major train stations as well.

Furthermore, a quick Google search shows that most major train stations have either money exchange services and/or bank offices that do exchange services.